initial changes to support wellsaid tts (#29)

lib/utils/speech-utils.js

@@ -75,11 +75,38 @@ const testMicrosoftStt = async(logger, credentials) => {
   return true;
 };
 
+const testWellSaidTts = async(logger, credentials) => {
+  const {api_key} = credentials;
+  try {
+    const post = bent('https://api.wellsaidlabs.com', 'POST', 'buffer', {
+      'X-Api-Key': api_key,
+      'Accept': 'audio/mpeg',
+      'Content-Type': 'application/json'
+    });
+    const mp3 = await post('/v1/tts/stream', {
+      text: 'Hello, world',
+      speaker_id: '3'
+    });
+    logger.info(`testWellSaidTts succeeded and returned ${typeof mp3}`);
+    return true;
+  } catch (err) {
+    logger.info({err}, 'testWellSaidTts returned error');
+    throw err;
+  }
+};
+
+const testWellSaidStt = async(logger, credentials) => {
+  //TODO
+  return true;
+};
+
 module.exports = {
   testGoogleTts,
   testGoogleStt,
   testAwsTts,
+  testWellSaidTts,
   testAwsStt,
   testMicrosoftTts,
-  testMicrosoftStt
+  testMicrosoftStt,
+  testWellSaidStt,
 };